KNTV NBC Nightly News With Lester Holt March 4, 2022 02:52:00
Notified us that they built signatures to identify the destructive malware we encouraged sharing that broadly across allies and partners. >> reporter: u.s. officials warn that vladimir putin still has the ability to cut off critical communications and cripple vital infrastructure in ukraine. but so far, russia's cyber offensive has been limited to denial of service attacks on the defense ministry and banks. >> i am surprised we haven't seen a more massive cyber attack against ukraine, against other nato nations or against us. >> i think we have to be very much on guard against that possibility...